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fdisk: ignore 0 endsecotor for partition geometry discovery

--- a/sys/src/libdisk/disk.c

+++ b/sys/src/libdisk/disk.c

@@ -113,7 +113,7 @@

 		}

 	}

-	if(h == -1)

+	if(h < 0 || s <= 0)

 		return -1;

 	disk->h = h+1;	/* heads count from 0 */

-- 

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